Apparatus for forming tapering pipe



(No Model.)

C. M. CARNAHAN. APPARATUS FOR PORMING T ABRING PIPE.

2 Sheets-Sheet 1.

agentedJune'so, 1891.

l N V E N TO R @ft/W4 714 E NURRIS YYEHS O0., PHBTD'UTHU., WASHINGYUN D C WITNESSES CYRUS M. CARNAHAN, CORAOPOLIS, ASSIGNOR TO ALPHRETTA CARNA- HAN, OF SAME PLACE, AND JOSEPH C. YOUNG, OF ROBINSON TOIVNSHIP, PENNSYLVANIA.

APPARATUS FOR FORIVIING TAPERING PIPE.

SPECIFICATION forming part of Letters Patent No. 455,274, dated .I une 30, 1891. Application filed August 1l., 1890. Serial No. 361,709. (No model.)

To @ZZ whom t may concern,.- ard G, and the bar 7 passes through the stand- Beit known that I, CYRUS M. CARNAHAN, ard, and at its rear end is pivotally conof Coraopolis, in the county of Allegheny and nected to an arm 9, which is journaled on a State of Pennsylvania, have invented a new shaft 10, as shown in Fig. 4. On this shaft is 5 and useful Improvement in Apparatus for a wheel l1. havingaplain beveled periphery, 3 5 Forming Tapering Pipe, of which the followand theshaft is driven through a gearing 12 ing is a full, clear, and exact description, refand a counter-shaft 13 by a shaft 14, the roerence being had to the accompanying drawtation of which is produced by suitable gearings, forming part of this specification, in ing 15, connected with a pinion 16 on the xo Whicllshaft of one of the rolls, so that the rot-ation 6o Figure 1 is a side elevation, partly in secofthe wheel l1 shall be exactly proportionate tion, of my improved apparatus. Fig. 2 is a to the rotation of the rolls. The arm 9 is profront elevation of the rolls. Fig. 3 is a vervided with a clamping device by which it may tical section on the line III III of Fig. 2. Fig. beattached to the wheel 11, and which conr5 4 is a detail view. Fig. 5 is a side elevation sists of an arm 17, adapted to fit against the 6D of the mandrel, showing it inside a pipe be- Wheel 11 and provided with a screw-bolt 1S tween the rolls, the sections of the mandrel which passes through the arm 9 and has a beingv contracted. Fig. 6 is a similar View handle 19, by which the bolt may be turned showing the mandrel expanded. Fig. 7 is a to draw the arm tightly against the wheel. 2o cross-section on the line VII VII of 6. At the beginning of the pipe-welding opera- 7c Fig. 8 is a cross-section on the line VIII VIII tion the arm 9, with the rod 7, is advanced and of Fig. 5. is clamped to the wheel l1, and then as the Like symbols of reference indicate like Wheel revolves it will retract the rod to conparts in each. tract the mandrel-sections. To restrain the 25 In the drawings, 2 2 are the rolls which I use motion of the rod 7 within proper limits, I pro- 75 in making tapering pipe or hollow bars. They vide it with a pin 20, which fits in a longiare set in suitable housings 3 and driven by tudinal slot in the tube 8. The sections of suitable pinions, and are formed with pethe `mandrel are expanded by longitudinal ripheral grooves, which afford a pass of the motion of the bar 7,' the end of which passes .3o same shape as the exterior outline of the pipe between the opposite sections, as shown in the 8o or bar to be formed therein, and which taper drawings. in depth and width conformably to the taper The operation is as follows: The skelp or desired to be formed on such pipe orfbar. metal plate to be formed into the tapering (See Fig. 3.) hollow bar or pipe isv made in tapering form,

3 5 The mandrel which I use in the interior of and having been bent around into the form 8 5 the pipe is shown in the figures on Sheet-1 of desired is heated to a welding heat. The the drawings. Itconsists of a head composed Vmandrel, with its sections projected to their of a number of sections 4 4,' preferably four full extent, is situate between the rolls in the in number, which are tied together near their grooved pass, and the bent skelp is fed, larger 4o front end by an encircling band or wire 5, end foremost, into the pass of the rolls out- 9o the front end of the sections being preferably side the mandrel', as shown in Fig. 6, the seam tapered externally. They are'also beveled on of the skelp being adjacent to the middle their inner sides so that their rear portions portion of one of the sections 4f. The rotainay be spread, as shown in Fig. 6, in'order to tion of the rolls draws the skelp forward over 45 vary the effective cross-section of the mandrel. lthe tube 8. Said tube prevents the mandrel 95 7 is a bar having its -end of wedge shape, from moving with the skelp and the pressure adapted to enter the space between the rear of the rolls on the lapping parts of the seam portions of the sectionsa and to spread them. welds them securely together. As thepipe 8 is a tube through which the bar 7 is inadvances, the gearing 16,15, 14:, 13, and 12 ro- 5o serted. This tube extends back to a standtates the wheel 11 proportionately to thejoroo tat-ion of the rolls, and thus retracts the wedge rod 7 correspondingly, so that as the operative parts of the grooves of the rolls diminish in cross-sectional dimensions, the sections of the mandrel are correspondingly contracted, and that at every part of the progress of the pipe as it tapers in dimension the mandrel affords to the seam a substantial internal support and resistance point or anvil. The rolling of the pipe and welding of the seam are continued until the pipe has passed entirely through the rolls onto the tube 8, from which it may be removed by removing the rod 7 from its support in the standard G and drawing it back With the tube S from Within the welded pipe. The length of pipe to be rolled should not be greater than the circumference of one of the rolls 2, one revolution of Which Welds and shapes the pipe. The apparatus shown in the drawings is adapted to form pipe of circular section; but various other cross-sectional shapes may be welded thereby by proper variation in shape of the mandrel and of the grooves in the rolls,

The advantages of my invention Willbe appreciated by those skilled in the art, The uses to which the apparatus are applicable are manifold. It may be employed in tapering pipe for vehicle poles and shafts, tongues, axles, sin gletrees, telegraph and electric poles, and for other purposes, and in use it will be found to be easy to operate, effective and econolnical in its action, and not liable to get out of order.

I claim l. An improvement in the art of making tapering pipe, which consists in subjecting the skelp to external compression and moving it over a contained contractible mandrel or support, and gradually contracting the mandrel during the compressing operation, sub stantially as and for the purposes described.

2. In apparatus for forming tapering-pipe, the combination ot' the rolls, a mandrel provided with contractible sections, a wedge for expanding the same, and gearing connecting the rolls with the Wedge to operate the same in adegree proportionate to the operation of the rolls, substantially as and for the purposes described.

3. In apparatus for forming tapering pipe, the combination, with the rolls, of a mandrel provided with projectible sections, a Wedgerod for projectingr the same, mechanism for moving the rod longitudinally, and gearing connected With the rolls and with said mechanism, substantially as and for the purposes described.

4. In apparatus for forming` tapering pipe, a mandrel composed of sections Ll-, pivotally connected together near one end, and a Wedge adapted to enter between the sections to expand them, substantially as and for the purposes described.

In testimonT whereof I have hereunto set my hand this (Sth day of August, A. D. 1890.

CYRUS M. GARNAHAN.

.Vitnesses:

W. l5. CORWIN, H. M. CoRWIN. 

